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feat(auth): add subject field to AccessToken #2446

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feat(auth): add subject field to AccessToken #2446

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1 change: 1 addition & 0 deletions src/mcp/server/auth/provider.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ class AccessToken(BaseModel):
scopes: list[str]
expires_at: int | None = None
resource: str | None = None # RFC 8707 resource indicator
subject: str | None = None # Subject identifier (typically the "sub" JWT claim / user ID)


RegistrationErrorCode = Literal[
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20 changes: 20 additions & 0 deletions tests/server/auth/middleware/test_auth_context.py
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Expand Up @@ -117,3 +117,23 @@ async def send(message: Message) -> None: # pragma: no cover
# Verify context is still empty after middleware
assert auth_context_var.get() is None
assert get_access_token() is None


def test_access_token_subject_field():
"""Test that AccessToken supports the optional subject field."""
# Without subject (backward compatible)
token_no_sub = AccessToken(
token="token1",
client_id="client1",
scopes=["read"],
)
assert token_no_sub.subject is None

# With subject
token_with_sub = AccessToken(
token="token2",
client_id="client2",
scopes=["read", "write"],
subject="user-123",
)
assert token_with_sub.subject == "user-123"
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